Check subname availability - Namespace

Check availability before generating mint transaction parameters. Use the method that matches the parent name’s listing: isL1SubnameAvailable for Ethereum, or isL2SubnameAvailable for an L2 chain.

Check availability on Ethereum

Use isL1SubnameAvailable for a parent name listed on Ethereum mainnet:

const isAvailable = await mintClient.isL1SubnameAvailable(
  'alice.example.eth',
);

Check availability on L2 chains

Use isL2SubnameAvailable with the target chain ID. This example checks Base:

import { base } from 'viem/chains';

const isAvailable = await mintClient.isL2SubnameAvailable(
  'alice.example.eth',
  base.id,
);